INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Held-to-maturity
Amortized Cost	$ 57.9
Fair Value	57.9
Available-for-sale
Amortized Cost	1,026.4	$ 926.1
Gross Unrealized Gains	0.2	0.1
Gross Unrealized Losses	(5.3)	(27.5)
Fair Value	1,021.3	898.7
Bank time deposits
Held-to-maturity
Amortized Cost	57.9	64.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	57.9	64.5
Available-for-sale
Amortized Cost	13.9	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	13.9	0.0
Commercial paper
Available-for-sale
Amortized Cost	236.5	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	236.5	0.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	238.1	72.7
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(1.1)	(2.8)
Fair Value	237.1	70.0
Asset-backed securities
Available-for-sale
Amortized Cost	70.2	192.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(1.4)	(7.8)
Fair Value	68.8	184.3
Corporate debt securities
Available-for-sale
Amortized Cost	465.0	658.5
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(2.8)	(16.7)
Fair Value	462.3	641.8
Municipal securities
Available-for-sale
Amortized Cost	2.7	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(0.2)
Fair Value	$ 2.7	$ 2.6

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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